(Portland, OR)  --  Terri Horman is seeking to have her name legally changed.  The stepmother of Kyron Horman filed a petition last month in Douglas County to change her name to Claire Stella Sullivan.  Terri Horman has been the subject of an investigation of the disappearance of Kyron, who vanished from Skyline School in June 2010.  The boy was seven-years-old at the time.